This is another case where I can't do much better than the site I'm quoting, and instead want to just call attention to it.

W3C wrote in a news item:

2005-08-22: W3C has written to the US Copyright Office regarding a notice of proposed rulemaking. The notice asks if persons filing electronic-only preregistration forms will experience difficulties if the Office requires them to use Microsoft's Internet Explorer Web browser. W3C comments to the Copyright Office suggest that requiring a single browser is inappropriate for government services and encourages the Office to pursue standards-based access in accordance with US Federal policy. Read W3C's letter and About W3C.